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copied!<p>I'm not sure whether I should just copy/paste from a <a href="http://wallerdev.com/2008/12/25/changing-the-user-agent-in-ie-net-webbrowser-control-via-csharp" rel="noreferrer">website</a>, but I'd rather leave the answer here, instead of a link. If anyone can clarify in comments, I'll be much obliged.</p> <p>Basically, you have to extend the WebBrowser class.</p> <pre><code>public class ExtendedWebBrowser : WebBrowser { bool renavigating = false; public string UserAgent { get; set; } public ExtendedWebBrowser() { DocumentCompleted += SetupBrowser; //this will cause SetupBrowser to run (we need a document object) Navigate("about:blank"); } void SetupBrowser(object sender, WebBrowserDocumentCompletedEventArgs e) { DocumentCompleted -= SetupBrowser; SHDocVw.WebBrowser xBrowser = (SHDocVw.WebBrowser)ActiveXInstance; xBrowser.BeforeNavigate2 += BeforeNavigate; DocumentCompleted += PageLoaded; } void PageLoaded(object sender, WebBrowserDocumentCompletedEventArgs e) { } void BeforeNavigate(object pDisp, ref object url, ref object flags, ref object targetFrameName, ref object postData, ref object headers, ref bool cancel) { if (!string.IsNullOrEmpty(UserAgent)) { if (!renavigating) { headers += string.Format("User-Agent: {0}\r\n", UserAgent); renavigating = true; cancel = true; Navigate((string)url, (string)targetFrameName, (byte[])postData, (string)headers); } else { renavigating = false; } } } } </code></pre> <p>Note: To use the method above you’ll need to add a COM reference to “Microsoft Internet Controls”.</p> <p>He mentions your approach too, and states that the WebBrowser control seems to cache this user agent string, so it will not change the user agent without restarting the process.</p>

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